Description: Rasengan is a Ninjutsu technique developed over the span of three years by the Fourth Hokage,who created it as an Futon element. The technique has been taught to his sensei Jiraiya, who then passed it on to the young ninja Naruto years later. Like Kage Bunshin no Jutsu, Naruto would adopt the technique as a signature move and make it all his own. The technique is unlike other jutsu in that it does not require any hand seals, it just relied on the ninja's ability to mold wind chakra. The ninja concentrates a contained, fast, rotating sphere of wind chakra in the palm of their hand which can cause much destructive impact.

Thus the technique was pure shape manipulation of chakra,which is used in Futon style, unlike most Futon elemental techniques which are shape and nature manipulation. Hatake Kakashi stated the technique was unfinished for this reason, as the Yondaime Hokage did not get a chance to add some form of nature manipulation to it and it was even unclear whether it is even possible for an elemental nature to be added. Naruto dedicated himself to this task though, in the hopes of fusing his Wind elemental nature with the Rasengan's shape manipulation. He eventually succeeded after long and hard training, which took advantage of Kage Bunshin's memory absorption capabilities. He was able to finish the Jutsu in the span of a few weeks what would have taken a normal ninja numerous years.